1925-26 Holley NH. The 1923-25 version of this model was identical except for the needle valve
adjuster assembly.

Introduced in 1920, the first version of the NH had an almost
straight-through passage from intake to outlet (left). Shortly after this a revised version with a
dip in this passage became standard. There were several modifications in the NH; early models
(until about 1923) had the bowl drain valve off-center, separate from the bowl-retaining
screw.
In 1923 the carburetor was modified and then the drain was part of the retaining screw at the
bottom. In 1925 the needle valve adjuster was changed to the universal-joint type (late 1925
and 1926 cars). This carburetor was manufactured by both Holley and Ford; the Ford version
being labeled with the Ford name.